17 flashcards · Shared on 19 August 2026 by AtomAI Library
Flip each card to check yourself.
Which change defines oxidation in a redox reaction?
Loss of electrons and an increase in oxidation number
Which change defines oxidation in a redox reaction?
Loss of electrons and an increase in oxidation number
Reduction is best described as which process?
Gain of electrons and a decrease in oxidation number
What is an oxidizing agent?
A substance that accepts electrons and is reduced
What is a reducing agent?
A substance that loses electrons and causes reduction
Which rule applies to the oxidation numbers in a neutral compound?
Their sum equals zero
What is the oxidation number of sulfur in the sulfate ion, SO₄²⁻?
+6
In the permanganate ion, MnO₄⁻, what is the oxidation number of manganese?
+7
What is the oxidation number of oxygen in hydrogen peroxide, H₂O₂?
−1
What is the oxidation number of hydrogen in the metal hydride NaH?
−1
Fluorine has an oxidation number of −1 in OF₂. What is the oxidation number of oxygen?
+2
In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, which species is oxidized?
Zn
For the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, which species acts as the oxidizing agent?
Cu²⁺
Which reaction is not a redox reaction?
HCl + NaOH → NaCl + H₂O
Which description best defines disproportionation?
One species is both oxidized and reduced in the same reaction
Which half-equation correctly represents the oxidation of Fe²⁺ to Fe³⁺?
Fe²⁺ → Fe³⁺ + e⁻
In acidic solution, how many electrons are required to reduce one MnO₄⁻ ion to Mn²⁺?
5
When a redox equation is balanced, what must be true about electron transfer?
The number of electrons lost equals the number gained